This coming June will mark the 3rd year with the replacement OEM battery without registration. I have had no issues to date.

Can you give us the name model number of the exact battery you purchased? Thanks in advance.

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If no codes are being thrown use Chevron Techron fuel injector cleaner (concentrate). It solves rpm fluctuating upon cold start-up. Also, for most BMW problems start off by scanning your car with the Peake Research Tool. It contains the actual BMW codes. If you want to register a newly installed battery for free (just buy a $10 cable) and google/download BMWLogger

Hubby and I are working on replaced the battery in his 335i using the DIY. Great job of explaining the process. While I was out getting the new battery he was doing the di-assemble. We are wondering about a black bus with one wire coming out of it. He didn't see it on dis-assemble and has no idea where it came from. We have stopped installation and am looking for ideas as to what the h..l it is.

Changed my battery for an OEM replacement today, going to register it myself when my cable arrives in a few days. A few notes about my experience:
- The 90 ah exude battery was $205 from my dealer and did not include a vent elbow
- Removal of the old battery was very straight forward, only needed 8 and 10 mm sockets.
- The only difficult part was removing/installing the larger 90 ah battery into the compartment. I ended up using zip ties to tie all of the cables out of the way after a few failed attempts.
- On first restart I had 4x4, DTC, and hill start assist errors which went away after a few hundred yards of driving. Also had to reset the time.
- The original battery was still working and had not failed but was showing signs of failure, and the indicator on top was not lit at all.

Cool, I will probably pick one of these batteries at Walmart. The price now is 109.00. There is also the Energizer one but only Sams club has it and is $99.00 dlls but then you have to have a memberhip. So problably Walmart will be the one to go with.

Did you take it to a shop to have it registered, or did you do it yourself?

Cool, I will probably pick one of these batteries at Walmart. The price now is 109.00. There is also the Energizer one but only Sams club has it and is $99.00 dlls but then you have to have a memberhip. So problably Walmart will be the one to go with.

Did you take it to a shop to have it registered, or did you do it yourself?

Thanks

Local E90 Post member did it for me. Quite harder than I expected since it's not exactly the same specs as OEM.